/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.jdbc.support.rowset;

import org.springframework.jdbc.InvalidResultSetAccessException;
import org.springframework.lang.Nullable;

import java.sql.ResultSetMetaData;
import java.sql.SQLException;

/**
 * The default implementation of Spring's {@link SqlRowSetMetaData} interface, wrapping a
 * {@link java.sql.ResultSetMetaData} instance, catching any {@link SQLException SQLExceptions}
 * and translating them to a corresponding Spring {@link InvalidResultSetAccessException}.
 *
 * <p>Used by {@link ResultSetWrappingSqlRowSet}.
 *
 * @author Thomas Risberg
 * @author Juergen Hoeller
 * @see ResultSetWrappingSqlRowSet#getMetaData()
 * @since 1.2
 */
public class ResultSetWrappingSqlRowSetMetaData implements SqlRowSetMetaData {

    private final ResultSetMetaData resultSetMetaData;

    @Nullable
    private String[] columnNames;


    /**
     * Create a new ResultSetWrappingSqlRowSetMetaData object
     * for the given ResultSetMetaData instance.
     *
     * @param resultSetMetaData a disconnected ResultSetMetaData instance
     *                          to wrap (usually a {@code javax.sql.RowSetMetaData} instance)
     * @see java.sql.ResultSet#getMetaData
     * @see javax.sql.RowSetMetaData
     * @see ResultSetWrappingSqlRowSet#getMetaData
     */
    public ResultSetWrappingSqlRowSetMetaData(ResultSetMetaData resultSetMetaData) {
        this.resultSetMetaData = resultSetMetaData;
    }


    @Override
    public String getCatalogName(int column) throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.getCatalogName(column);
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

    @Override
    public String getColumnClassName(int column) throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.getColumnClassName(column);
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

    @Override
    public int getColumnCount() throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.getColumnCount();
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

    @Override
    public String[] getColumnNames() throws InvalidResultSetAccessException {
        if (this.columnNames == null) {
            this.columnNames = new String[getColumnCount()];
            for (int i = 0; i < getColumnCount(); i++) {
                this.columnNames[i] = getColumnName(i + 1);
            }
        }
        return this.columnNames;
    }

    @Override
    public int getColumnDisplaySize(int column) throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.getColumnDisplaySize(column);
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

    @Override
    public String getColumnLabel(int column) throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.getColumnLabel(column);
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

    @Override
    public String getColumnName(int column) throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.getColumnName(column);
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

    @Override
    public int getColumnType(int column) throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.getColumnType(column);
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

    @Override
    public String getColumnTypeName(int column) throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.getColumnTypeName(column);
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

    @Override
    public int getPrecision(int column) throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.getPrecision(column);
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

    @Override
    public int getScale(int column) throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.getScale(column);
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

    @Override
    public String getSchemaName(int column) throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.getSchemaName(column);
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

    @Override
    public String getTableName(int column) throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.getTableName(column);
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

    @Override
    public boolean isCaseSensitive(int column) throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.isCaseSensitive(column);
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

    @Override
    public boolean isCurrency(int column) throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.isCurrency(column);
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

    @Override
    public boolean isSigned(int column) throws InvalidResultSetAccessException {
        try {
            return this.resultSetMetaData.isSigned(column);
        } catch (SQLException se) {
            throw new InvalidResultSetAccessException(se);
        }
    }

}
